Lock.



G. H. LAMB.

LOOK. APPLICATION FILED 1TOV.22, 1013. 1,104,052. Patented July 21,1914" o I b GEORGE HUNT LAMB, on LONDON, ENGLAND.

LOCK.

Specification of Letters Patent.

Patented July 21, 1914.

Application filed November 22, 1913. Serial No. 802,490.

To all whom it may concern:

Be it known that I, GEORGE HUNT LAMB, a subject of the King of GreatBritain and Ireland, residing at London, England, have inventedImprovements in Locks, of which the following is a specification.

This invention relates to a padlock or other lock of the type having, agapped ring forming the shackle which is secured by a bolt shotinto'engagement with the gap.

The, invention consists in an improved construction whereby a lock ofthis type is made to lock automatically when the ring is turned into theposition in which the gap is in register with the bolt.

The accompanying illustrative drawing shows, in elevation with the coverplate removed, a padlock constructed according to the invention.

Thecasing a of the padlock is provided with parallel guideways Z) formedconveniently integral therewith and between which there is arranged aslide a bolt 0 that is adapted to be held in the normal or lockedposition by a helical spring (Z housed within a recess 6 of the bolt 0.One end of the spring bears against one end of the recess 6 and theother end of the spring bears against an appropriate abutment 7 whichalso serves to limit the travel of the bolt.

The outer solid portion of the bolt 0 can extend as shown across thepathway of a Copies of this patent may be obtained for five cents each,by addressing the Commissioner of ll'atents,

guided annular link 9, whose continuity is lnterrupted at it so as toform a gap into which the outer end of the bolt 0 shoots automaticallywhen said gap is brought into register therewith by rotation of the link9 in the act of locking. I

Then it is desired to unfasten the pad look by rotation of the link 9the springoperated bolt 0 is withdrawn from the gap V k by a suitablekey of ordinary type having a lateral wing turning about the pivot 2'and engaging one or other of the lugs j in a manner well'understood; Thekey is indicated in dotted lines at it.

What I claim is In a lock, a ring formed with a gap, a

casing, curved guides in said casing in which said ring can rotate, abolt formed with aslot, webs in said casing between which said bolt canslide toward and from said ring, a.

stop in said casing projecting within the slot of sald bolt, a springbetween said stop and one end of the slot of said bolt, a pivot for akey in said casing, and arms on said bolt adapted to be engaged by a keyturning about said pivot.

Signed at London, England, this elev Washington, D. C.

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